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Ships within 48 hours · Estimated delivery Sep 3 - Sep 8
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Description
knockout herbicide CrystalClear KnockOut PlusCrystalClear KnockOut PLUS is an all natural, fish treatment that eliminates PLUS prevents external single celled parasites or fungal infections. KnockOut PLUS works extremely well with pond fish species such as koi and goldfish and unlike most fish treatments, there is no need to remove your filters before treatment. Furthermore, when used routinely, KnockOut PLUS works as a strong preventative treatment. Use anytime new fish are added, during pond
CrystalClear® KnockOut™ PLUS is an all natural, fish treatment that eliminates PLUS prevents external single-celled parasites or fungal infections. KnockOut™ PLUS works extremely well with pond fish species such as koi and goldfish and unlike most fish treatments, there is no need to remove your filters before treatment. Furthermore, when used routinely, KnockOut™ PLUS works as a strong preventative treatment. Use anytime new fish are added, during pond clean-outs, during spring start-up or any time fish are stressed.
KnockOut™ PLUS is a broad spectrum treatment for a variety of parasites including ichthyophthirius (Ick), sporozoan parasite, dinoflagellate infections as well as fungi such as saprolegnia, achlya, leptomitus and pythium. May be used with most invertebrates including snails.
KnockOut™ PLUS is a broad spectrum treatment for a variety of parasites including ichthyophthirius (Ick), sporozoan parasite, dinoflagellate infections as well as fungi such as saprolegnia, achlya, leptomitus and pythium. May be used with most invertebrates including snails.
- 7 Day Treatment
- Remedies Ich, Parasites, Bacterial Infections & Fungus
- All Natural, Safe for Fish, Plants & the Pond's Ecosystem
- Prevents Future Infections
Dosage Rate
Use 1 fl oz of KnockOut™ PLUS per 60 gallons.
8 fl oz bottle treats up to 960 gallons.
128 fl oz / 1 gal bottle treats to to 7,680 gallons.
Standard Application Rate
Shake well before using. Upon discovery of infection, apply daily for 7 days. When there are no visible signs of infection, it is recommended to continue treatment daily for an additional 3 days to ensure infection will not return. Disperse over the majority of the surface area of the pond.
Persistent Problem Application Rate
Shake well before using. For infections that last more than 7 days after standard application, treat twice per day. Apply once in the morning and once in the evening. Do not apply as a bath application. KnockOut™ PLUS works best as an in-pond additive.
Preventative Application Rate
Treat daily for 7 days anytime new fish are added, during pond clean-outs, during spring start-up or any time fish are stressed.
Product Notices
Do not use other chemicals in pond while treating with Knockout™ PLUS.
Use 1 fl oz of KnockOut™ PLUS per 60 gallons.
8 fl oz bottle treats up to 960 gallons.
128 fl oz / 1 gal bottle treats to to 7,680 gallons.
Standard Application Rate
Shake well before using. Upon discovery of infection, apply daily for 7 days. When there are no visible signs of infection, it is recommended to continue treatment daily for an additional 3 days to ensure infection will not return. Disperse over the majority of the surface area of the pond.
Persistent Problem Application Rate
Shake well before using. For infections that last more than 7 days after standard application, treat twice per day. Apply once in the morning and once in the evening. Do not apply as a bath application. KnockOut™ PLUS works best as an in-pond additive.
Preventative Application Rate
Treat daily for 7 days anytime new fish are added, during pond clean-outs, during spring start-up or any time fish are stressed.
Product Notices
Do not use other chemicals in pond while treating with Knockout™ PLUS.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.6 ★★★★★
Based on 27 reviews
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Product Reviews
★★★★★ 5
Good option for an aftermarket replacement solution.
Size: 3+12+12+2+1 pack
I've been very happy with this product. I think it is a good price point for what is included. Everything was a directly compatible and everything fit as you would expect. The filter quality is good and since there are plenty in the kit I find I change the filters more often which is probably a good thing. I recommed.
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Reviewed in the United States on October 3, 2025
★★★★★ 5
Eufy Brushes wear out with daily use
Size: 4 Pack
These brushes help the Eufy continue to run efficiently. I have 2 dogs and run 2 Eufies daily. It is surprising how much sand, dust, gravel and hair gets vacuumed. My furniture isn't as dusty and my floor doesn't need mopping as often.
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Reviewed in the United States on January 7, 2026
★★★★★ 4
It works
Size: 2+12+12+2 pack
Fits as expected and it's nice to have so many replacement parts. This item is priced well.
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Reviewed in the United States on January 11, 2026
★★★★★ 5
Fits my old eufy
Size: 3+12+12+2+1 pack
This set fits my older model eufy and has extra parts for newer models. The filters did not fit our model (our fault for not doing proper research) but the fan sweeper is awesome.
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Reviewed in the United States on October 5, 2024
★★★★★ 5
Lots of extras!
Size: 2+12+12+2 pack
The brushes are a bit flimsier than the original but otherwise fine. I needed it for the rectangular filters more than anything
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Reviewed in the United States on March 7, 2026
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